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From ab03fc7dbf876e611f43be34faa6945728977056 Mon Sep 17 00:00:00 2001
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From: Vadim Rozenfeld <vrozenfe@redhat.com>
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Date: Mon, 3 Mar 2014 12:09:17 +0100
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Subject: [PATCH 05/12] kvm: make hyperv hypercall and guest os id MSRs migratable.
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RH-Author: Vadim Rozenfeld <vrozenfe@redhat.com>
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Message-id: <1393848564-10511-6-git-send-email-vrozenfe@redhat.com>
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Patchwork-id: 57961
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O-Subject: [RHEL-7.0 qemu-kvm v4 PATCH 05/12] kvm: make hyperv hypercall and guest os id MSRs migratable.
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Bugzilla: 1004773
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Igor Mammedov <imammedo@redhat.com>
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RH-Acked-by: Eduardo Habkost <ehabkost@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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Note: The field order in vmstate_msr_hypercall_hypercall follows the same
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      pattern as in RHEL6, but not upstream.
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Signed-off-by: Vadim Rozenfeld <vrozenfe@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 1c90ef2619dd6e5c4fec7e9e18c04c0a08e93aac)
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Conflicts:
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	target-i386/machine.c
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---
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 target-i386/cpu.h     |  2 ++
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 target-i386/kvm.c     | 16 ++++++++++++++--
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 target-i386/machine.c | 23 +++++++++++++++++++++++
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 3 files changed, 39 insertions(+), 2 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 target-i386/cpu.h     |    2 ++
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 target-i386/kvm.c     |   16 ++++++++++++++--
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 target-i386/machine.c |   23 +++++++++++++++++++++++
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 3 files changed, 39 insertions(+), 2 deletions(-)
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diff --git a/target-i386/cpu.h b/target-i386/cpu.h
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index 4c4c9ff..4835a64 100644
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--- a/target-i386/cpu.h
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+++ b/target-i386/cpu.h
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@@ -844,6 +844,8 @@ typedef struct CPUX86State {
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     uint64_t msr_fixed_counters[MAX_FIXED_COUNTERS];
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     uint64_t msr_gp_counters[MAX_GP_COUNTERS];
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     uint64_t msr_gp_evtsel[MAX_GP_COUNTERS];
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+    uint64_t msr_hv_hypercall;
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+    uint64_t msr_hv_guest_os_id;
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     /* exception/interrupt handling */
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     int error_code;
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diff --git a/target-i386/kvm.c b/target-i386/kvm.c
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index 495021b..943abe1 100644
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--- a/target-i386/kvm.c
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+++ b/target-i386/kvm.c
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@@ -1198,8 +1198,10 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
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                               env->msr_global_ctrl);
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         }
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         if (has_msr_hv_hypercall) {
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-            kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_GUEST_OS_ID, 0);
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-            kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_HYPERCALL, 0);
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+            kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_GUEST_OS_ID,
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+                              env->msr_hv_guest_os_id);
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+            kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_HYPERCALL,
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+                              env->msr_hv_hypercall);
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         }
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         if (has_msr_hv_vapic) {
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             kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_APIC_ASSIST_PAGE, 0);
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@@ -1475,6 +1477,10 @@ static int kvm_get_msrs(X86CPU *cpu)
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         }
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     }
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+    if (has_msr_hv_hypercall) {
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+        msrs[n++].index = HV_X64_MSR_HYPERCALL;
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+        msrs[n++].index = HV_X64_MSR_GUEST_OS_ID;
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+    }
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     msr_data.info.nmsrs = n;
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     ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, &msr_data);
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     if (ret < 0) {
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@@ -1576,6 +1582,12 @@ static int kvm_get_msrs(X86CPU *cpu)
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         case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL0 + MAX_GP_COUNTERS - 1:
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             env->msr_gp_evtsel[index - MSR_P6_EVNTSEL0] = msrs[i].data;
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             break;
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+        case HV_X64_MSR_HYPERCALL:
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+            env->msr_hv_hypercall = msrs[i].data;
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+            break;
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+        case HV_X64_MSR_GUEST_OS_ID:
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+            env->msr_hv_guest_os_id = msrs[i].data;
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+            break;
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         }
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     }
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diff --git a/target-i386/machine.c b/target-i386/machine.c
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index 08b4ed3..817f8e4 100644
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--- a/target-i386/machine.c
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+++ b/target-i386/machine.c
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@@ -506,6 +506,26 @@ static const VMStateDescription vmstate_msr_architectural_pmu = {
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     }
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 };
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+static bool hyperv_hypercall_enable_needed(void *opaque)
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+{
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+    X86CPU *cpu = opaque;
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+    CPUX86State *env = &cpu->env;
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+
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+    return env->msr_hv_hypercall != 0 || env->msr_hv_guest_os_id != 0;
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+}
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+
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+static const VMStateDescription vmstate_msr_hypercall_hypercall = {
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+    .name = "cpu/msr_hyperv_hypercall",
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+    .version_id = 1,
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+    .minimum_version_id = 1,
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+    .minimum_version_id_old = 1,
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+    .fields      = (VMStateField []) {
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+        VMSTATE_UINT64(env.msr_hv_guest_os_id, X86CPU),
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+        VMSTATE_UINT64(env.msr_hv_hypercall, X86CPU),
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+        VMSTATE_END_OF_LIST()
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+    }
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+};
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+
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 const VMStateDescription vmstate_x86_cpu = {
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     .name = "cpu",
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     .version_id = 12,
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@@ -638,6 +658,9 @@ const VMStateDescription vmstate_x86_cpu = {
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             .vmsd = &vmstate_msr_architectural_pmu,
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             .needed = pmu_enable_needed,
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         }, {
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+            .vmsd = &vmstate_msr_hypercall_hypercall,
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+            .needed = hyperv_hypercall_enable_needed,
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+        } , {
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             /* empty */
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         }
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     }
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-- 
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1.7.1
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